Currently Sanna Vaarni works as a Senior Lecturer in Piano and as a Head of Piano Department at the Espoo Music Institute, the leading music school in Finland. During recent years she has been giving master classes in music institutes and conservatories in Finland, China (Beijing Central Conservatory of Music, Ningbo International Institute) and in Europe. She works regularly as an assistant of professor Konstantin Bogino at Campus delle Arti, Italy. In 2020 she will teach as an assistant of K. Bogino also at the AIMRoma (Accademia Internazionale Musicale di Roma). Vaarni has been lecturing for teachers in the department of continuing education in Sibelius Academy. Her students have been among prize winners in both national and international piano competitions for young pianists and they have performed at music festivals like Espoo International Piano Festival, OperaEstate Festival Veneto and Shanghai Arts Festival.

In February 2019 she was invited to give a teaching demonstration at the National Piano Seminar in Finland.